mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
187 lines
6.1 KiB
C
187 lines
6.1 KiB
C
/******************************************************************************
|
|
* x86_emulate.h
|
|
*
|
|
* Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
|
|
*
|
|
* Copyright (c) 2005 Keir Fraser
|
|
*
|
|
* From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
|
|
*/
|
|
|
|
#ifndef __X86_EMULATE_H__
|
|
#define __X86_EMULATE_H__
|
|
|
|
struct x86_emulate_ctxt;
|
|
|
|
/*
|
|
* x86_emulate_ops:
|
|
*
|
|
* These operations represent the instruction emulator's interface to memory.
|
|
* There are two categories of operation: those that act on ordinary memory
|
|
* regions (*_std), and those that act on memory regions known to require
|
|
* special treatment or emulation (*_emulated).
|
|
*
|
|
* The emulator assumes that an instruction accesses only one 'emulated memory'
|
|
* location, that this location is the given linear faulting address (cr2), and
|
|
* that this is one of the instruction's data operands. Instruction fetches and
|
|
* stack operations are assumed never to access emulated memory. The emulator
|
|
* automatically deduces which operand of a string-move operation is accessing
|
|
* emulated memory, and assumes that the other operand accesses normal memory.
|
|
*
|
|
* NOTES:
|
|
* 1. The emulator isn't very smart about emulated vs. standard memory.
|
|
* 'Emulated memory' access addresses should be checked for sanity.
|
|
* 'Normal memory' accesses may fault, and the caller must arrange to
|
|
* detect and handle reentrancy into the emulator via recursive faults.
|
|
* Accesses may be unaligned and may cross page boundaries.
|
|
* 2. If the access fails (cannot emulate, or a standard access faults) then
|
|
* it is up to the memop to propagate the fault to the guest VM via
|
|
* some out-of-band mechanism, unknown to the emulator. The memop signals
|
|
* failure by returning X86EMUL_PROPAGATE_FAULT to the emulator, which will
|
|
* then immediately bail.
|
|
* 3. Valid access sizes are 1, 2, 4 and 8 bytes. On x86/32 systems only
|
|
* cmpxchg8b_emulated need support 8-byte accesses.
|
|
* 4. The emulator cannot handle 64-bit mode emulation on an x86/32 system.
|
|
*/
|
|
/* Access completed successfully: continue emulation as normal. */
|
|
#define X86EMUL_CONTINUE 0
|
|
/* Access is unhandleable: bail from emulation and return error to caller. */
|
|
#define X86EMUL_UNHANDLEABLE 1
|
|
/* Terminate emulation but return success to the caller. */
|
|
#define X86EMUL_PROPAGATE_FAULT 2 /* propagate a generated fault to guest */
|
|
#define X86EMUL_RETRY_INSTR 2 /* retry the instruction for some reason */
|
|
#define X86EMUL_CMPXCHG_FAILED 2 /* cmpxchg did not see expected value */
|
|
struct x86_emulate_ops {
|
|
/*
|
|
* read_std: Read bytes of standard (non-emulated/special) memory.
|
|
* Used for instruction fetch, stack operations, and others.
|
|
* @addr: [IN ] Linear address from which to read.
|
|
* @val: [OUT] Value read from memory, zero-extended to 'u_long'.
|
|
* @bytes: [IN ] Number of bytes to read from memory.
|
|
*/
|
|
int (*read_std)(unsigned long addr, void *val,
|
|
unsigned int bytes, struct kvm_vcpu *vcpu);
|
|
|
|
/*
|
|
* read_emulated: Read bytes from emulated/special memory area.
|
|
* @addr: [IN ] Linear address from which to read.
|
|
* @val: [OUT] Value read from memory, zero-extended to 'u_long'.
|
|
* @bytes: [IN ] Number of bytes to read from memory.
|
|
*/
|
|
int (*read_emulated)(unsigned long addr,
|
|
void *val,
|
|
unsigned int bytes,
|
|
struct kvm_vcpu *vcpu);
|
|
|
|
/*
|
|
* write_emulated: Read bytes from emulated/special memory area.
|
|
* @addr: [IN ] Linear address to which to write.
|
|
* @val: [IN ] Value to write to memory (low-order bytes used as
|
|
* required).
|
|
* @bytes: [IN ] Number of bytes to write to memory.
|
|
*/
|
|
int (*write_emulated)(unsigned long addr,
|
|
const void *val,
|
|
unsigned int bytes,
|
|
struct kvm_vcpu *vcpu);
|
|
|
|
/*
|
|
* cmpxchg_emulated: Emulate an atomic (LOCKed) CMPXCHG operation on an
|
|
* emulated/special memory area.
|
|
* @addr: [IN ] Linear address to access.
|
|
* @old: [IN ] Value expected to be current at @addr.
|
|
* @new: [IN ] Value to write to @addr.
|
|
* @bytes: [IN ] Number of bytes to access using CMPXCHG.
|
|
*/
|
|
int (*cmpxchg_emulated)(unsigned long addr,
|
|
const void *old,
|
|
const void *new,
|
|
unsigned int bytes,
|
|
struct kvm_vcpu *vcpu);
|
|
|
|
};
|
|
|
|
/* Type, address-of, and value of an instruction's operand. */
|
|
struct operand {
|
|
enum { OP_REG, OP_MEM, OP_IMM, OP_NONE } type;
|
|
unsigned int bytes;
|
|
unsigned long val, orig_val, *ptr;
|
|
};
|
|
|
|
struct fetch_cache {
|
|
u8 data[15];
|
|
unsigned long start;
|
|
unsigned long end;
|
|
};
|
|
|
|
struct decode_cache {
|
|
u8 twobyte;
|
|
u8 b;
|
|
u8 lock_prefix;
|
|
u8 rep_prefix;
|
|
u8 op_bytes;
|
|
u8 ad_bytes;
|
|
u8 rex_prefix;
|
|
struct operand src;
|
|
struct operand dst;
|
|
unsigned long *override_base;
|
|
unsigned int d;
|
|
unsigned long regs[NR_VCPU_REGS];
|
|
unsigned long eip;
|
|
/* modrm */
|
|
u8 modrm;
|
|
u8 modrm_mod;
|
|
u8 modrm_reg;
|
|
u8 modrm_rm;
|
|
u8 use_modrm_ea;
|
|
unsigned long modrm_ea;
|
|
unsigned long modrm_val;
|
|
struct fetch_cache fetch;
|
|
};
|
|
|
|
struct x86_emulate_ctxt {
|
|
/* Register state before/after emulation. */
|
|
struct kvm_vcpu *vcpu;
|
|
|
|
/* Linear faulting address (if emulating a page-faulting instruction) */
|
|
unsigned long eflags;
|
|
|
|
/* Emulated execution mode, represented by an X86EMUL_MODE value. */
|
|
int mode;
|
|
|
|
unsigned long cs_base;
|
|
unsigned long ds_base;
|
|
unsigned long es_base;
|
|
unsigned long ss_base;
|
|
unsigned long gs_base;
|
|
unsigned long fs_base;
|
|
|
|
/* decode cache */
|
|
|
|
struct decode_cache decode;
|
|
};
|
|
|
|
/* Repeat String Operation Prefix */
|
|
#define REPE_PREFIX 1
|
|
#define REPNE_PREFIX 2
|
|
|
|
/* Execution mode, passed to the emulator. */
|
|
#define X86EMUL_MODE_REAL 0 /* Real mode. */
|
|
#define X86EMUL_MODE_PROT16 2 /* 16-bit protected mode. */
|
|
#define X86EMUL_MODE_PROT32 4 /* 32-bit protected mode. */
|
|
#define X86EMUL_MODE_PROT64 8 /* 64-bit (long) mode. */
|
|
|
|
/* Host execution mode. */
|
|
#if defined(__i386__)
|
|
#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32
|
|
#elif defined(CONFIG_X86_64)
|
|
#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT64
|
|
#endif
|
|
|
|
int x86_decode_insn(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops);
|
|
int x86_emulate_insn(struct x86_emulate_ctxt *ctxt,
|
|
struct x86_emulate_ops *ops);
|
|
|
|
#endif /* __X86_EMULATE_H__ */
|